Gena <gen### [at] yahoocom> wrote in news:4084a443$1@news.povray.org:

> Another useful POV-Tree feature could be ability to apply
> to the tree such effects as wind and gravity. I'm planning
> to implement that as two sliders in preview panel. A
> horizontal slider could represent a wind and a vertical
> one could represent a gravity.

AFAIK this sounds more like physical simulation of soft bodies.
One way to model soft bodies is with an "armature" composed of particles 
connected by springs (sometimes called mass-spring systems), those system 
are particularly suited for clothes simulation systems.
I believe that Cristoph Hormann's MechSim is a good example of what such a 
system looks like.
SimPOV at http://www-public.tu-bs.de:8080/~y0013390/simpov/index.html.
MegaPOV at http://megapov.inetart.net/

> As far as I understand this falls into particle systems
> category of CG. Does anybody have a good reference to
> this subject (preferably on-line?

See above.

--
Alessandro Falappa

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